测试文件夹是否可写

gistfile1.php

function dir_writeable($dir) {
    $writeable = 0;
    if(!is_dir($dir)) {
        @mkdir($dir, 0777);
    }
    if(is_dir($dir)) {
        if($fp = @fopen("$dir/test.txt", 'w')) {
            @fclose($fp);
            @unlink("$dir/test.txt");
            $writeable = 1;
        } else {
            $writeable = 0;
        }
    }
    return $writeable;
}